Vacancy-free cubic superconducting NbN enabled by quantum anharmonicity

Eva Kogler, Mihir R. Sahoo, Chia-Nien Tsai +10

Niobium nitride (NbN) is renowned for its exceptional mechanical, electronic, magnetic, and superconducting properties. The ideal 1:1 stoichiometric $\delta$-NbN cubic phase, however, i…